New York county well guide

Well Water in Sullivan County, NY: Testing, Contractors and Rules

About 12,144 households in Sullivan County, 41% of the county, rely on a private well. Nobody tests that water unless the owner does.

Labs within 40 milesLicensed contractors
41%of households on a private well
Share on wells, county vs state
Sullivan County41%
New York average25%
19licensed contractors serve the county
3 mito the nearest certified lab, AG Environmental RSC LLC
Nostatewide test required when a home is sold

Most homes in Sullivan County are on a private well: about 12,144 households, 41% of the county. That makes Sullivan County one of the places in New York where the water department is the homeowner.

Local rules for wells in Sullivan County

Private wells in Sullivan County follow New York's statewide rules, administered by NYS Department of Environmental Conservation. No water test is required by the state when a new well is completed. There is no statewide test requirement when a home is sold, though lenders often ask for one. The cards below show the details and the official sources.

At a glance

Water test for a new wellNot required statewide

No single statewide rule. The driller must be DEC-registered, file a preliminary notice before drilling, disinfect the finished well under NYSDOH Appendix 5-B, and send a well completion report to DEC and to you within 30 days. NYSDOH says a new well should be tested before use for coliform bacteria, nitrate, nitrite, arsenic, lead, iron, manganese, sodium, hardness, pH and turbidity. Many county health departments (Westchester, Rockland, Putnam, Dutchess, Suffolk and others) require a permit and a passing water test before a new well can be used.

Water test when a home is soldNot required statewide

No statewide requirement. A few counties and towns require a well test or well inspection when a property changes hands, and FHA, VA and USDA loans usually ask for a bacteria and nitrate test. Check with the county health department.

What the state recommends

NYSDOH recommends a coliform bacteria test every year, plus a first-time panel of nitrate, nitrite, arsenic, lead, iron, manganese, sodium, sulfate, hardness, pH, alkalinity and turbidity, then periodic re-testing of whatever showed up. Add radon, uranium, methane or PFAS where they are known in your area.

Free or low-cost testingAvailable

No statewide free program. Several county health departments run their own ELAP-certified labs and sell low-cost bacteria and nitrate tests (Erie, Monroe, Suffolk, Nassau, Cattaraugus, Chautauqua, Allegany). Others keep a list of local certified labs.

Getting your water tested near Sullivan County

4 certified labs within 40 miles serve Sullivan County, starting with AG Environmental RSC LLC in Ferndale (about 3 miles from the county center). Each card below shows whether the lab takes homeowner samples and which tests it is certified for.

4 certified labs within 40 miles

Licensed well contractors serving Sullivan County

19 licensed contractors serve Sullivan County, including Amber Water Pros, LLC and Delta Well & Pump Co Inc. Each profile carries the state license number and the date we checked it, and the filters below sort them by drilling, pump work or treatment.

Well depth and water chemistry

Wells in Sullivan County typically reach 100 to 400 ft in bedrock across most of upstate; 30 to 150 ft in glacial sand and gravel valleys and on Long Island. What comes up with the water depends on the aquifer, and across New York the usual suspects are coliform bacteria, nitrate (farm valleys and older septic areas), arsenic (parts of central and western new york), iron and manganese. A first full panel tells you which of them apply to your well.

Typical well depth

Varies by location. Check the state well record search for logs of nearby wells.

Contaminants to test for
  • Coliform bacteria
  • Nitrate (farm valleys and older septic areas)
  • Arsenic (parts of central and western New York)
  • Iron and manganese
  • Hardness (limestone country)
  • Sodium and chloride (road salt)
  • Sulfate and hydrogen sulfide (shale areas)
  • Radon and uranium (Southern Tier and Adirondack bedrock)
  • Methane (Southern Tier shale)
  • PFAS (Hoosick Falls
  • Newburgh and other hot spots)
  • Barium and fluoride (western New York)

Neighboring counties: Orange County, Ulster County, Delaware County, Dutchess County.

What well work costs in Sullivan County

Bacteria test (coliform and E. coli)$32published New York lab fees
Nitrate test$80published New York lab fees
Broad panel (metals and minerals)$384 to $583published New York lab fees
Well inspection$250 to $550$350 to $900 with water testing
Submersible pump replacement$1,000 to $2,500installed; deep wells cost more
Pressure tank replacement$800 to $1,500installed
One treatment unit$700 to $3,500softener, iron filter or UV, installed
Multi-stage whole-house treatment$2,500 to $10,000+several units or whole-house RO, installed
New well, complete$6,000 to $16,000typical 200 ft well with pump; drilling alone about $20 to $30 per foot; deeper wells cost more
Shock chlorination$80 to $200by a contractor; under $30 to do yourself

Westchester County lab fees ($32.10 bacteria, $80.25 nitrate, well packages $383.51 and $583.10). Installed costs are national 2026 ranges; local quotes vary with depth, access and materials. Sources, checked September 2026: Westchester County lab fee schedule, HomeGuide cost guides, Angi: cost to shock a well.

Questions Sullivan County well owners ask

How many homes in Sullivan County are on a well?

About 12,144, or 41% of households, based on Census housing data and state well surveys. The share is highest outside the towns with public water.

Where is the closest certified lab to Sullivan County?

AG Environmental RSC LLC in Ferndale, about 3 miles away. Call first to ask whether they accept homeowner samples.

Do I need a permit to drill a well in Sullivan County?

No single statewide rule. The driller must be DEC-registered, file a preliminary notice before drilling, disinfect the finished well under NYSDOH Appendix 5-B, and send a well completion report to DEC and to you within 30 days. NYSDOH says a new well should be tested before use for coliform bacteria, nitrate, nitrite, arsenic, lead, iron, manganese, sodium, hardness, pH and turbidity. Many county health departments (Westchester, Rockland, Putnam, Dutchess, Suffolk and others) require a permit and a passing water test before a new well can be used.

What does a well test cost near Sullivan County?

Published lab fees in New York: $32 for a bacteria test and $80 for nitrate. Westchester County lab fees ($32.10 bacteria, $80.25 nitrate, well packages $383.51 and $583.10). Mail-in kits cost about the same as walking in.